Servlet+JSP实现简单的用户管理（无数据库）增删改查
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2022-06-28 16:16:36
项目结构：用户实体类User，后台管理类（servlet类）UserManage.java用户列表页userList.jsp，用户新增页userAdd.jsp，用户修改页userUpdate.jsp实现功能：展示用户列表，用户新增、修改、删除功能效果图如下：userList.jsp<%@ page import="java.util.List" %><%@ page import="POJO.User" %><%@ page import="java.uti...
项目结构：用户实体类User，
后台管理类（servlet类）UserManage.java
用户列表页userList.jsp，用户新增页userAdd.jsp，
用户修改页userUpdate.jsp
实现功能：展示用户列表，用户新增、修改、删除功能
效果图如下：userList.jsp
<%@ page import="java.util.List" %>
<%@ page import="POJO.User" %>
<%@ page import="java.util.Date" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<table border="1" cellspacing="0" align="center" bgcolor="#f0ffff">
<tr><td><a href="userAdd.jsp">新增</a></td></tr>
<tr style="font-weight: bold">
<td colspan="2" style="text-align: center;">操作</td>
<td>id</td>
<td>姓名</td>
<td>年龄</td>
</tr>
<c:forEach items="${list}" var="user">
<tr>
<td><a href="UserManage?method=findById&id=${user.id}">编辑</a></td>
<td><a href="UserManage?method=delete&id=${user.id}">删除</a></td>
<td>${user.id}</td>
<td>${user.name}</td>
<td>${user.age}</td>
</tr>
</c:forEach>
</table>
</body>
</html>
userAdd.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="UserManage" method="post">
<table cellspacing="0" border="1 solid black" bgcolor="#f0ffff" align="center">
<tr>
<td>id:</td>
<td><input type="text" name="id"></td><br/>
</tr>
<tr>
<td>名字:</td>
<td><input type="text" name="name"></td><br/>
</tr>
<tr>
<td>年龄:</td>
<td><input type="text" name="age"></td><br/>
</tr>
<tr>
<td>
<input type="submit" value="保存" align="">
<input type="reset" value="重置" align="">
</td>
</tr>
</table>
</form>
</body>
</html>
userUpdate.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="UserManage" method="post">
<table cellspacing="0" border="1 solid black" bgcolor="#f0ffff" align="center">
<tr>
<td>id:</td>
<td>
<input type="text" name="id" value="${user.id}" readonly></td>
</tr>
<br/>
<tr>
<td>名字:</td>
<td>
<input type="text" name="name" value="${user.name}"></td>
</tr>
<br/>
<tr>
<td>年龄:</td>
<td>
<input type="text" name="age" value="${user.age}"></td>
</tr>
<br/>
<td><input type="submit" value="保存"></td>
</table>
</form>
</body>
</html>
UserManage.java
import POJO.User;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@WebServlet("/UserManage")
public class UserManage extends HttpServlet {
private Map<Integer, User> map = new HashMap<>();
public UserManage() {
map.put(1, new User("1", "刘备", "18"));
map.put(2, new User("2", "孙权", "20"));
map.put(3, new User("3", "曹操", "30"));
map.put(4, new User("4", "项羽", "21"));
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
String method = req.getParameter("method");
if (method == null) {
method = "save";
}
String idStr = req.getParameter("id");
String name = req.getParameter("name");
String scoreStr = req.getParameter("age");
Integer id = Integer.parseInt(idStr);
Integer score = Integer.parseInt(scoreStr);
User user = new User(idStr, name, scoreStr);
map.put(id, user);
resp.sendRedirect("/web/UserManage");
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if (method == null) {
method = "findall";
}
if (method.equals("delete")) {
String idStr = req.getParameter("id");
Integer id = Integer.parseInt(idStr);
map.remove(id);
resp.sendRedirect("/web/UserManage");
} else if (method.equals("findall")) {
req.setAttribute("list", map.values());
req.getRequestDispatcher("userList.jsp").forward(req, resp);
} else if (method.equals("findById")) {
String idStr = req.getParameter("id");
Integer id = Integer.parseInt(idStr);
User use = map.get(id);
req.setAttribute("user", use);
req.getRequestDispatcher("userUpdate.jsp").forward(req, resp);
}
}
}
User.java
package POJO;
public class User {
private String id;
private String name;
private String age;
public User(String id, String name, String age) {
this.id = id;
this.name = name;
this.age = age;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}
本文地址：https://blog.csdn.net/weixin_46009468/article/details/112229982